Vine, the video service introduced by Twitter in January, now has 40 million registered users, it said Tuesday.

The mobile service, which lets users capture and share looping videos, had over 13 million users in June.

The new figure for registered users, disclosed by Vine in a Twitter message, suggests that the concept of sharing short videos of up to six seconds duration has since taken off.

Competitor Instagram, a photo-sharing service with over 130 million active users, introduced its own short video creation and sharing service in June. Facebook acquired Instagram last year.

"We've said this before and we'll say it again: this community - now more than 40 million of you - is amazing. Thank you for inspiring us," Vine said in its Twitter message. A spokeswoman confirmed that the figure was for registered users, and not active users, which could mean that some of the 40 million users of the service have signed up but not used the service after that.

The Vine app is currently available for both Android devices and iOS devices like Apple's iPhone. The app for Android was added in June.

John Ribeiro covers outsourcing and general technology breaking news from India for The IDG News Service. Follow John on Twitter at @Johnribeiro. John's e-mail address is john_ribeiro@idg.com